Grímsvötn, the Icelandic volcano that caused travel chaos nine years ago, is on the verge of erupting again, experts have warned.
The last time it went off back in 2011 it created ash clouds - causing the cancellation of around 900 flights. Scientists last week recorded 'seismic activity' - meaning magma is swelling and could bring unwanted movement.
Now, authorities have raised the Aviation Colour Code from green to yellow. That means there is a level of concern over a future eruption.
Volcano expert Dave McGarvie, who works at at the University of Lancaster, wrote in The Conversation : "Increasing thermal activity has been melting more ice and there has also been a recent increase in earthquake activity. "Ash clouds therefore only
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